import numpy as np
# arr = np.random.rand(3,4)
# print(arr)


# import numpy as np
# arr = np.random.randint(5,11,[2,3])
# print(arr)

# import numpy as np
# arr = np.arange(4)
# print(arr)

# import numpy as np
# arr = np.arange(1,10,2)
# print(arr)


# import numpy as np
# arr = np.arange(0,1,0.2)
# print(arr)

# import numpy as np
# arr = np.arange(5,0,-1)
# print(arr)




# 区间5到12左闭右开元素个数5个
# import numpy as np
# arr = np.linspace(5,12,num=5,endpoint=False,retstep=True)
# print(arr)


# 指数区间为2到8左闭右开元素个数5底数2
# import numpy as np
# arr = np.logspace(2,8,num=5,endpoint=False,base=2)
# print(arr)

